Open this next book.
Once he died, Cheng Zhen was bound to a "suspect" system, requiring him to travel through different cases to find the real culprit and clear the original suspect's suspicion.
Old old houses, dim streets...
Sin breeds here, but justice is never late.
I saw you, where else do you think you can hide?
System: (interruption) Well, we are a serious reasoning system, there is no need to be mysterious.
Cheng Zhen: Okay, let me tell you straight, the murderer is...
System: Wait! You are hated because you always reveal the murderer!
Cheng Zhen: Trouble.
System: Just follow the process and look for evidence first. And don't forget, if your reasoning is wrong... You will say goodbye to this world forever QWQ
The male protagonist has no CP and is cool.
(Original) reasoning essay
Techniques are the main focus, let's guess the murderer together QAQ
The little angel who is the first to guess the method and the murderer will be served with a big red envelope (although there is no text, I will put a flag here first)
The First European Emperor [Quickly Wear]